> But who wants boxes of DVD's cluttering up the place?

I buy Blu-Rays at charity shops, strip them from the case and once ripped slide them in to a CD wallet with the inner leaflet. A horror show if you were collecting with cases but works for if you desire to own movie to NAS legally.

> Could someone turn this into a business where they store all those DVD's you bought, on your behalf?

Someone did, got sued and the business took the shock and closed down. They used to let you buy old stocked DVD's they owned. When you cancelled your subcription they sent you back the DVD's.